MCQ Questions for Class 12 Biology Chapter 13 Organisms and Populations with Answers

We have compiled the NCERT MCQ Questions for Class 12 Biology Chapter 13 Organisms and Populations with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 12 Biology with Answers on a daily basis and score well in exams. Refer to the Organisms and Populations Class 12 MCQs Questions with Answers here along with a detailed explanation.

Organisms and Populations Class 12 MCQs Questions with Answers

Multiple Choice Type Questions

Question 1.
The shifting of an organism temporarily from the stressful habitat to a more hospitable area and return when stressful period is over is called
(a) Suspend
(b) Migrate
(c) Hibernation
(d) Aestivation

Answer

Answer: (b) Migrate


Question 2.
Winter sleep is also called as
(a) Hibernation
(b) Suspend
(c) Migrate
(d) Aestivation

Answer

Answer: (a) Hibernation


Question 3.
To avoid summer-related problems – heat and desiccation by organism is called
(a) Hibernation
(b) Suspend
(c) Migrate
(d) Aestivation

Answer

Answer: (d) Aestivation


Question 4.
A stage of suspended development is called
(a) Diapause
(b) Suspend
(c) Migrate
(d) Aestivation

Answer

Answer: (a) Diapause


Question 5.
Both the species benefit in
(a) Parasitism
(b) Mutualism
(c) Competition
(d) Predation

Answer

Answer: (b) Mutualism


Question 6.
Both species lose in
(a) Mutualism
(b) Competition
(c) Parasitism
(d) Predation

Answer

Answer: (b) Competition


Question 7.
One species benefit in
(a) Parasitism
(b) Predation
(c) Mutualism
(d) Both (a) and (b)

Answer

Answer: (d) Both (a) and (b)


Question 8.
The interaction where one species is benefitted and the other is neither benefitted nor harmed is called
(a) Commensalism
(b) Amensalism
(c) Mutualism
(d) None of the above

Answer

Answer: (a) Commensalism


Question 9.
If one species is harmed whereas the other is unaffected is called
(a) Commensalism
(b) Amensalism
(c) Mutualism
(d) None of the above

Answer

Answer: (a) Commensalism


Question 10.
Parasites that feed on the external surface of the host organism are called
(a) Ecto parasites
(b) Endo parasites
(c) Brood parasitism
(d) None of the above

Answer

Answer: (a) Ecto parasites


Question 11.
Parasites that live inside the host body at different sities are called
(a) Ecto parasites
(b) Endo parasites
(c) Brood parasitism
(d) None of the above

Answer

Answer: (b) Endo parasites


Question 12.
The number of birth during a given period in the population that are added to the initial density is referred to
(a) Natality
(b) Mortality
(c) Sex-ratio
(d) None of the above

Answer

Answer: (a) Natality


Question 13.
The number of deaths in the population during a given period is referred to
(a) Natality
(b) Mortality
(c) Sex-ratio
(d) None of the above

Answer

Answer: (b) Mortality


Question 14.
The size of the population tells us a lot about its status in the
(a) Environment
(b) Sex-ratio
(c) Age pyramid
(d) Habitat

Answer

Answer: (d) Habitat


Question 15.
For human population, the age pyramids generally show age distribution of
(a) Only males
(b) Only females
(c) Of males and females
(d) None of the above

Answer

Answer: (c) Of males and females


Fill in the Blanks

Question 1.
Both species benefit in ………………..

Answer

Answer: mutualism


Question 2.
Both species lose in ………………..

Answer

Answer: competition


Question 3.
Only one species benefits in ………………..

Answer

Answer: parasitism


Question 4.
The interaction where one species is benefitted and the other is neither benefitted nor harmed is called ………………..

Answer

Answer: commensalism


Question 5.
One species is harmed whereas the other is unaffected is called ………………..

Answer

Answer: amensalism


Question 6.
Winter sleep is called ………………..

Answer

Answer: hibernation


Question 7.
……………….. interactions arise from the interaction of populations of two different species.

Answer

Answer: Interspecific


Question 8.
Lice is a ………………..

Answer

Answer: ectoparasite


Question 9.
Tapeworm is a ………………..

Answer

Answer: endoparasite


Question 10.
Squid is an example of ……………….. zone.

Answer

Answer: bentic


Write True or False

Question 1.
The number of births during a given period in the population that are added to the initial density is referred to as natality.

Answer

Answer: True


Question 2.
Winter sleep is called aestivation.

Answer

Answer: False


Question 3.
A stage of suspended development is called hibernation.

Answer

Answer: False


Question 4.
Opuntia is a desert plant.

Answer

Answer: True


Question 5.
Organisms can live is pressure greater than 100 times the normal pressure.

Answer

Answer: True


Question 6.
All organisms cannot tolerate a wide range of salinities.

Answer

Answer: False


Question 7.
The nature of properties of soil in different places vary.

Answer

Answer: True


Question 8.
Many fresh water animals cannot lie for long in sea water due to the salinity of sea water.

Answer

Answer: False


Question 9.
Lice is an example of endo parasite.

Answer

Answer: False


Question 10.
The female mosquito is not considered a parasite.

Answer

Answer: True


One Word Questions

Question 1.
Name a plant of the desert region.

Answer

Answer: Cactus.


Question 2.
Give an example of ectoparasite.

Answer

Answer: Lice.


Question 3.
Give an example of endoparasite.

Answer

Answer: Tapeworm.


Question 4.
Give an example of bentic zone.

Answer

Answer: Squid.


Question 5.
The process by which plant manufacture their food.

Answer

Answer: Photosynthesis.


Question 6.
What is the per cent of salt in inland water?

Answer

Answer: 5 per cent.


Question 7.
What is the per cent of salt in hypersaline lagoons?

Answer

Answer: > 100.


Question 8.
What is the stage of suspended development called?

Answer

Answer: Diapause.


Question 9.
Name a butterfly which is highly distasteful to its predator.

Answer

Answer: Monarch butterfly.


Question 10.
Name a starfish which is an important predator in the rocky intertidal communities of the American Pacific Coast.

Answer

Answer: Pisaster.


Match the Following

Column I Column II
1. Temporary moving from one place to another A. Hibernation
2. Winter sleep B. Diapause
3. A stage of suspended development C. Aestivation
4. Avoid summer heat D. Commensalism
5. One species benefit in E. Migration
Answer

Answer:

Column I Column II
1. Temporary moving from one place to another E. Migration
2. Winter sleep A. Hibernation
3. A stage of suspended development B. Diapause
4. Avoid summer heat C. Aestivation
5. One species benefit in D. Commensalism

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